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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > how to kill this under-steer



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      05-28-2013, 12:55 PM   #45
longliven54
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bit the bullet and ordered

powerflex subframe bushings
ps2's
and yes, booked for a 3 day professional track training. mods i do for this car will stay with the car. what i might learn from those 3 years will stick with me for much longer.
mission raceway here i come!!
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      05-30-2013, 01:40 AM   #46
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i think i found the problem. noticed rear passenger side a lil lower than rear drivers side

applying pressure over the trunk i can squeeze passenger side more. its time for a re-build on the koni yellows i guess. that explains mid corner awkward body weight transfer.
40k kms is rather quick for them to die.
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      05-30-2013, 05:41 AM   #47
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Anything will deteriorate faster when you constantly push its limits.
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      05-30-2013, 05:49 AM   #48
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How are the roads over there? Konis deteriorate quickly when used on rough rutted roads.
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      05-30-2013, 09:18 AM   #49
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Quote:
Originally Posted by longliven54 View Post
i think i found the problem. noticed rear passenger side a lil lower than rear drivers side

applying pressure over the trunk i can squeeze passenger side more. its time for a re-build on the koni yellows i guess. that explains mid corner awkward body weight transfer.
40k kms is rather quick for them to die.

Rebuild prob not - lifetime guarantee.

Had 10 yr old Koni's leak on my bike....salesman, seeing his commission slip away, swore Koni would prob not make good on such an old install.

Koni was as good as gold - new shocks showed up at my door. Hey! I'm sold....
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      05-30-2013, 01:00 PM   #50
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How are the roads over there? Konis deteriorate quickly when used on rough rutted roads.
roads up here are smooth as butter. shocks were not used with loweing springs, only zsp sport springs.
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      05-30-2013, 01:03 PM   #51
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Quote:
Originally Posted by CALWATERBOY View Post
Rebuild prob not - lifetime guarantee.

Had 10 yr old Koni's leak on my bike....salesman, seeing his commission slip away, swore Koni would prob not make good on such an old install.

Koni was as good as gold - new shocks showed up at my door. Hey! I'm sold....
cool. i thot koni recommends rebuild every 40k miles, dont they?
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      05-30-2013, 03:42 PM   #52
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Quote:
Originally Posted by longliven54 View Post
cool. i thot koni recommends rebuild every 40k miles, dont they?

That's a pretty good question....dunno....

There is a Koni rebuild center HERE - used to be centers in Canoga Park & Sonoma, CA
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      05-30-2013, 04:01 PM   #53
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Quote:
Originally Posted by CALWATERBOY View Post
Rebuild prob not - lifetime guarantee.

Had 10 yr old Koni's leak on my bike....salesman, seeing his commission slip away, swore Koni would prob not make good on such an old install.

Koni was as good as gold - new shocks showed up at my door. Hey! I'm sold....
Lifetime guarantee on Konis? I never knew that. Bilsteins yeah they have lifetime. Konis you should rebuild/refresh every so often and they say so. Maybe their old moto shocks had lifetime?
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      09-08-2013, 10:30 AM   #54
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Quote:
Originally Posted by longliven54 View Post
i have had my e90 for a few years now, and mileage was adding up quick. so i picked up a 90 nissan 300zx TT to be my daily driver. i was very happy with my e90's handling up until i drove the 300zx. now whenever i drive my e90, it feels like a big boat hovering around on the road. i feel the e90 understeers a lot and i wish to bring some grip to the front or maybe make the rear slide out more to counter the understeer.
here is my suspension mod list

koni yellows all around
zsp springs from e92 mt(i believe mt e92 have the shortest springs)
dinan camber
m3 front control arms
sp lowering perches
cusco strut bar
megan racing toe
no LSD
245's upfront/255 rears to minimize stagger(pirelli rosso)

i have thought about installing front sway bar, but i have heard it can induce more understeer. UPgrading rear sway bar makes the car fish-tail happy unless LSD is already installed. is there no other way to get more grip upfront to kill this body roll & understeer?
Ran into your suspension thread searching for something else. Was curious to ask if you ever solved your problem?

You got absolutely awful advice at first then some others chimed in with much better advice. Still no one ever brought up proper suspension tuning advice such as logging tire temps, adjusting your roll couple distrbution, calculating suspension frequencies, etc, etc. so I was wondering how it all turned out.
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      09-12-2013, 03:01 PM   #55
longliven54
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Quote:
Originally Posted by RallyRcrr
Quote:
Originally Posted by longliven54 View Post
i have had my e90 for a few years now, and mileage was adding up quick. so i picked up a 90 nissan 300zx TT to be my daily driver. i was very happy with my e90's handling up until i drove the 300zx. now whenever i drive my e90, it feels like a big boat hovering around on the road. i feel the e90 understeers a lot and i wish to bring some grip to the front or maybe make the rear slide out more to counter the understeer.
here is my suspension mod list

koni yellows all around
zsp springs from e92 mt(i believe mt e92 have the shortest springs)
dinan camber
m3 front control arms
sp lowering perches
cusco strut bar
megan racing toe
no LSD
245's upfront/255 rears to minimize stagger(pirelli rosso)

i have thought about installing front sway bar, but i have heard it can induce more understeer. UPgrading rear sway bar makes the car fish-tail happy unless LSD is already installed. is there no other way to get more grip upfront to kill this body roll & understeer?
Ran into your suspension thread searching for something else. Was curious to ask if you ever solved your problem?

You got absolutely awful advice at first then some others chimed in with much better advice. Still no one ever brought up proper suspension tuning advice such as logging tire temps, adjusting your roll couple distrbution, calculating suspension frequencies, etc, etc. so I was wondering how it all turned out.
upon inspection I found that passenger side lower shock mount was missing 1 bolt and other was loose which made the shock move around, hence giving that body roll type feeling.
I have since installed new lower shock mounts and ride is super good. car feels very stable, absorbs all road bumps without unsettling the car.

I even attended a 3 day performance driving school, and car felt great. I could have benefited with higher spring rates and a LSD but a super smooth dd is my priority and LSD is lil too much money(for me) to justify.
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      09-12-2013, 03:01 PM   #56
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Quote:
Originally Posted by RallyRcrr
Quote:
Originally Posted by longliven54 View Post
i have had my e90 for a few years now, and mileage was adding up quick. so i picked up a 90 nissan 300zx TT to be my daily driver. i was very happy with my e90's handling up until i drove the 300zx. now whenever i drive my e90, it feels like a big boat hovering around on the road. i feel the e90 understeers a lot and i wish to bring some grip to the front or maybe make the rear slide out more to counter the understeer.
here is my suspension mod list

koni yellows all around
zsp springs from e92 mt(i believe mt e92 have the shortest springs)
dinan camber
m3 front control arms
sp lowering perches
cusco strut bar
megan racing toe
no LSD
245's upfront/255 rears to minimize stagger(pirelli rosso)

i have thought about installing front sway bar, but i have heard it can induce more understeer. UPgrading rear sway bar makes the car fish-tail happy unless LSD is already installed. is there no other way to get more grip upfront to kill this body roll & understeer?
Ran into your suspension thread searching for something else. Was curious to ask if you ever solved your problem?

You got absolutely awful advice at first then some others chimed in with much better advice. Still no one ever brought up proper suspension tuning advice such as logging tire temps, adjusting your roll couple distrbution, calculating suspension frequencies, etc, etc. so I was wondering how it all turned out.
upon inspection I found that passenger side lower shock mount was missing 1 bolt and other was loose which made the shock move around, hence giving that body roll type feeling.
I have since installed new lower shock mounts and ride is super good. car feels very stable, absorbs all road bumps without unsettling the car.

I even attended a 3 day performance driving school, and car felt great. I could have benefited with higher spring rates and a LSD but a super smooth dd is my priority and LSD is lil too much money(for me) to justify.
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JB4 G5 / VRSF IC / STETT CAI / GREDDY / custom exhaust / iRotora cross drilled rotots / snow stage 3 meth / 19" iForged senekas / upgraded speakers n CF woofer box / M3 bits/ DINAN camber plates/ KONI/ megan racing toe arm/ supreme power lowering perch
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      09-12-2013, 03:01 PM   #57
longliven54
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Quote:
Originally Posted by RallyRcrr
Quote:
Originally Posted by longliven54 View Post
i have had my e90 for a few years now, and mileage was adding up quick. so i picked up a 90 nissan 300zx TT to be my daily driver. i was very happy with my e90's handling up until i drove the 300zx. now whenever i drive my e90, it feels like a big boat hovering around on the road. i feel the e90 understeers a lot and i wish to bring some grip to the front or maybe make the rear slide out more to counter the understeer.
here is my suspension mod list

koni yellows all around
zsp springs from e92 mt(i believe mt e92 have the shortest springs)
dinan camber
m3 front control arms
sp lowering perches
cusco strut bar
megan racing toe
no LSD
245's upfront/255 rears to minimize stagger(pirelli rosso)

i have thought about installing front sway bar, but i have heard it can induce more understeer. UPgrading rear sway bar makes the car fish-tail happy unless LSD is already installed. is there no other way to get more grip upfront to kill this body roll & understeer?
Ran into your suspension thread searching for something else. Was curious to ask if you ever solved your problem?

You got absolutely awful advice at first then some others chimed in with much better advice. Still no one ever brought up proper suspension tuning advice such as logging tire temps, adjusting your roll couple distrbution, calculating suspension frequencies, etc, etc. so I was wondering how it all turned out.
upon inspection I found that passenger side lower shock mount was missing 1 bolt and other was loose which made the shock move around, hence giving that body roll type feeling.
I have since installed new lower shock mounts and ride is super good. car feels very stable, absorbs all road bumps without unsettling the car.

I even attended a 3 day performance driving school, and car felt great. I could have benefited with higher spring rates and a LSD but a super smooth dd is my priority and LSD is lil too much money(for me) to justify.
__________________
JB4 G5 / VRSF IC / STETT CAI / GREDDY / custom exhaust / iRotora cross drilled rotots / snow stage 3 meth / 19" iForged senekas / upgraded speakers n CF woofer box / M3 bits/ DINAN camber plates/ KONI/ megan racing toe arm/ supreme power lowering perch
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